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You don't need methylcobalamin for SC administration. Some people believe that you can't use hydroxocobalamin SC because the packaging and Patient Information Leaflet only mention IM. But that's because it's only licensed for IM in the UK (and methyl isn't licensed at all).

If you buy your hydroxo online from Germany then you'll see that the packaging and PIL all say that it's OK for SC as well as IM. And you can buy proper, sterile, single-dose ampoules rather than risking contamination by making it up yourself.

Some symptoms improve fairly quickly (I stopped getting pursued by the Black Dog so often pretty quickly) others may take a long time. clivealive will tell you that there are still some symptoms after 40-something years.